Lock the angle
Choose how to set the viewer's vantage point — the eye the 3D scene is built around.
Best illusion
Use a reference photo
Drop in a photo taken from where the audience will actually stand, then mark the four corners of the screen — that exact vantage point becomes the eye of the scene.
or
Safest
Center view
Skip the photo and start with the viewer centred, straight-on. It's also possible to set the viewer position by hand afterward, by dragging the camera object.